May weather forecast
Upland, CA

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Weather in May

The last month of the spring, May, is a warm month in Upland, California, with an average temperature fluctuating between 53.6°F (12°C) and 76.6°F (24.8°C).

Temperature

The onset of May brings an average high-temperature of a moderately hot 76.6°F (24.8°C), nearly matching the April temperature. Nightly average temperatures in May reveal a significant dip from daytime highs, registering a consistent a fresh 53.6°F (12°C).

Humidity

The months with the highest humidity are March and May, with an average relative humidity of 54%.

Rainfall

In Upland, in May, during 3.8 rainfall days, 0.24" (6mm) of precipitation is typically accumulated. Throughout the year, in Upland, there are 49.6 rainfall days, and 7.8" (198mm) of precipitation is accumulated.

Snowfall

In Upland, snow does not fall in January, March through December.

Daylight

In May, the average length of the day in Upland, California, is 13h and 57min.
On the first day of the month, sunrise is at 6:00 am and sunset at 7:34 pm. On the last day of May, in Upland, sunrise is at 5:40 am and sunset at 7:56 pm PDT.

Sunshine

In Upland, the average sunshine in May is 11.8h.

UV index

In May, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for the average person.
Note: The maximum UV index of 6 during May translates into these guidelines:
Adopt measures and apply sun safety strategies. Shielding from skin and eye damage is necessary. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. Opt for tightly woven and loose clothing to enhance protection from the Sun.
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Frequently asked questions

What are the temperatures in Upland in May?

The average high-temperature, in May, in Upland, is 76.6°F (24.8°C), while the average low-temperature is 53.6°F (12°C).

What is the most humid month in Upland?

March and May, with an average relative humidity of 54%, are most humid months.

What is the average humidity in May in Upland?

In Upland, the average relative humidity in May is 54%.

How many days does it rain in May in Upland?

In May, in Upland, California, the rain falls for 3.8 days. Throughout May, 0.24" (6mm) of precipitation is accumulated.

When it does not snow in Upland?

January, March through December are months without snowfall.

What is the average length of the day in May in Upland?

In Upland, California, the average day length in May is 13h and 57min.

What time are sunrise and sunset in May in Upland?

On the first day of May in Upland, sunrise is at 6:00 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 5:40 am and sunset at 7:56 pm PDT.

How many hours of sunshine does Upland have in May?

The average sunshine duration in May in Upland, California, is 11.8h.

What is the UV index reading in May in Upland?

In Upland, the average daily maximum UV index in May is 6. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Upland, CA

Average temperature in May - Upland, CA
  • Average high temperature in May: 76.6°F

The warmest month (with the highest average high temperature) is August (91°F).
The month with the lowest average high temperature is December (62.1°F).

  • Average low temperature in May: 53.6°F

The month with the highest average low temperature is August (65.8°F).
The coldest month (with the lowest average low temperature) is December (45.5°F).

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Average pressure in May
Upland, CA

Average pressure in May - Upland, CA
  • Average pressure in May: 29.91"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).

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Average wind speed in May
Upland, CA

Average wind speed in May - Upland, CA
  • Average wind speed in May: 5.8mph

The windiest months (with the highest average wind speed) are April and May (5.8mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).

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Average humidity in May
Upland, CA

Average humidity in May - Upland, CA
  • Average humidity in May: 54%

The months with the highest relative humidity are March and May (54%).
The month with the lowest relative humidity is August (42%).

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Average rainfall in May
Upland, CA

Average rainfall in May - Upland, CA
  • Average rainfall in May: 0.24"

The wettest month (with the highest rainfall) is February (1.77").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in May
Upland, CA

Average rainfall days in May - Upland, CA
  • Average rainfall days in May: 3.8 days

The month with the highest number of rainy days is March (7.1 days).
The month with the least rainy days is June (1.2 days).

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Average snowfall days in May
Upland, CA

Average snowfall days in May - Upland, CA
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

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Average daylight in May /
Average sunshine in May
Upland, CA

Average daylight in May / Average sunshine in May - Upland, CA
  • Average daylight in May: 14h and 0min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in May: 11h and 5min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are February and December (Average sunshine: 6h and 54min).

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Average sunshine days in May
Upland, CA

Average sunshine days in May - Upland, CA
  • Average sunshine days in May: 26 days

The month with the most sunshine days is June (28.2 days).
The month with the least sunshine days is February (21.5 days).

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Average UV index in May
Upland, CA

Average UV index in May - Upland, CA
  • Average UV index in May: 6

The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in May
Upland, CA

Average cloud cover in May - Upland, CA
  • Average cloud cover in May: 13

The month with the most cloud cover is December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).

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Average visibility in May
Upland, CA

Average visibility in May - Upland, CA
  • Average visibility in May: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Upland, California, USA

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